Platform/Qemu/SbsaQemu: Add SMBIOS tables

o Add SMBIOS 3.4.0 tables using ArmPkg/Universal/Smbios.
o Bump the PcdSmbiosVersion PCD from 0x300 to 0x304 to indicate support
  for SMBIOS 3.4.0, as is required by SBBR.
o Add an implementation of OemMiscLib that provides the system
  information. The serial numbers, asset tags etc. are currently all
  fixed strings, to allow fwts to pass without errors.
o Add SMBIOS PCDs to identify the platform. The processor serial
  number, asset tag and part number are populated because otherwise
  fwts reports errors.

Signed-off-by: Rebecca Cran <rebecca@nuviainc.com>
Reviewed-by: Leif Lindholm <leif@nuviainc.com>